Granted Patent
Utility
US 4,661,932 · App. 06/561,487
Dynamic downhole recorder
Inventors:
Mig A. Howard, Louis H. Barnard
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Dec 14, 1983
Inventors
Mig A. Howard
Louis H. Barnard
Assignee (at issue)
Hughes Tool Company - USA
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.